Support PHP 8

[sandrokeil]

php-cs-fixer binary is not ready yet for PHP 8 but php-cs-fixer can be run < PHP 8.0. So it's ready to merge.

[sandrokeil]

@prolic @codeliner I think it can be merged now. I don’t have the access rights to do this and to create a new release.

[prolic]

@sandrokeil there seems to be a problem, see travis results:

$ ./vendor/bin/php-cs-fixer fix -v --diff --dry-run

PHP needs to be a minimum version of PHP 5.6.0 and maximum version of PHP 7.4.*.

The command "./vendor/bin/php-cs-fixer fix -v --diff --dry-run" exited with 1.

[prolic]

@sandrokeil as PHP 8 installation is possible with php-cs-fixer, but it's not possible to run it as of now, we can just skip php-cs-fixer for PHP 8 runs on travis. This should do the trick so we can get this pushed forward.

[sandrokeil]

@prolic I fixed it. (Travis is so slow)

[prolic]

Thanks!